Numerical Simulation Of The Soft Soil Indoor Creep Test And Practical Engineering Application

The soft soil is distributed extensively in our country, especially the coastal area such as Pearl River Delta. Soft soil has natural low strength, high compressibility, little permeability, long consolidation time, notable rheological characteristics etc. So the structures built on the soft soil foundation often have the problems of large settlement and insufficient of bearing capacity of foundation etc. Following dozens years of the theoretical study of the soft soil rheological characteristics, a great deal of success has been made. A lot of achievements have been applied widely to the project very well. Following the wide application of the FEM in the geomechanical engineering, especially the application of some large-scale finite element softwares, like ABAQUS, ADINA, ANSYS, etc., the numerical simulation is carried on the creep behavior of the soft soil .More abundant and more detailed achievement then indoor test can be gotten, and some limitation of the indoor test can be overcome. And then it is applied to the practical soft soil engineering. Numerical simulation has already become a new developing study trend in recent years.The rheological theory is introduced systematically in this paper, and the principle and method of soft clay in indoor rheological test are also introduced. Based on a series of relevant indoor tests for the soft soil of Nansha in Guangzhou by our study team and a large number of test results that have been gotten, the large-scale finite element software ABAQUS is used to simulate the creep behavior of soft soil with extended Drucker-Prager model and proper model parameters. The numerical simulation results are contrasted with results of indoor creep tests. It shows that calculation results are consistent with test results well.On the basis of the above-mentioned study, according to soft soil foundation engineering, it is calculated by numerical method. The numerical results conform well to the measured data. It testifies further to the rationality of the model and parameters chosen.In the paper, the deformation characteristics and the failure characteristics of the soil samples are gotten through numerical simulation. And the laws of deformation characteristics and the distribution of the pore water pressure in the soft soil foundation engineering are gotten too. These promote the testing data and measured data, and can evaluate the soft soil deformation and predicate back-work settlement. This work is very important to the practical engineering and soil mechanics theory.